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Thread: Dark Green Water

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    Sallie's Avatar
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    Dark Green Water

    Last summer our pump broke at the end of the season, ordered new one and hubby plans to install this week-end. We did lower the water below the skimmer and returns before winter. The pool water is dark green. I've been through this before. I went through SO MANY bottles of bleach before my problem was corrected. I'm just wondering if it would be easier to just take a lot of the water out of the pool. Does anyone suggest this? And if so, how much can I lower it? Pool guy once said that if you lowered the water in a vinyl pool too much, that it could pop out. (I don't think those were his exact words.)

    I do know the routine, have a good test kit, etc., but I was just wondering if getting rid of all that green water would be easier. I think I know the answer.
    Sallie
    25 K gal., vinyl IG, Hayward 3/4 hp pump, Hayward Pro Series S-220T 18" sand filter, full sun all day, no main drain, Pool Solutions PS232 test kit - Columbia, SC

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    Mod Squad jblizzle's Avatar
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    Re: Dark Green Water

    You need to leave at least 1 foot of water in the shallow end to lower the risk of the liner from lifting or shifting.
    You will still need to follow the ShockLevelAndMAINTAIN Process to clear up the pool ... hope you have enough FAS-DPD reagent. If not, order some refills.
    Jason, TFP Moderator
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    duraleigh's Avatar
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    Re: Dark Green Water

    I'm just wondering if it would be easier to just take a lot of the water out of the pool.
    The biggest problem with that is the algae simply grows back almost immediately. You need to SLAM the pool and then maintain FC levels high enough so you don't get recurrences.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Dark Green Water

    If your CYA level is in check, then draining water is pointless. Just start the SLAM, do it properly, and you'll have a good looking pool in no time.

    Now, if your CYA level is sky high, then draining water would be relevant.
    10,000 gallon in ground diamond brite, Circupool si30+, Hayward C900 cartridge, 1.5hp Flotec single speed pump

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    Casey's Avatar
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    Re: Dark Green Water

    SLAM it!
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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    Sallie's Avatar
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    Re: Dark Green Water

    Okay, so I think everyone agrees that I shouldn't lower the level of water.

    1. Going to check CYA in a bit. I think I have some, just probably low. If I need to raise it, would I do that first? I know it usually says on the bottle to run pump continuously and not backwash for a certain period of time, but it's so gunky, will I be able to not backwash during the period it says?
    2. Would I adjust ph before CYA or after?
    3. Where do I go on here to change my password? I'm having lots of computer issues, phone issues, just trying to deal with a lot...There was a link when I had to have my password re-set, and I should have been able to follow that to change it, but my stupid computer wouldn't let me go there.
    4. Also, what do I adjust to make sure I'm notified when someone responds to a post of mine? I had several replies but had not been notified as I have in the past.
    5. Thanks for all the help. I know this is a process, just need someone to hold my hand and get me started in the right direction.
    Sallie
    25 K gal., vinyl IG, Hayward 3/4 hp pump, Hayward Pro Series S-220T 18" sand filter, full sun all day, no main drain, Pool Solutions PS232 test kit - Columbia, SC

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    Richard320's Avatar
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    Re: Dark Green Water

    Quote Originally Posted by Sallie View Post
    Okay, so I think everyone agrees that I shouldn't lower the level of water.

    1. Going to check CYA in a bit. I think I have some, just probably low. If I need to raise it, would I do that first? I know it usually says on the bottle to run pump continuously and not backwash for a certain period of time, but it's so gunky, will I be able to not backwash during the period it says?
    You want CYA to be about 30 for the SLAM. If you need to raise it, pour the granules in a sock or nylon and tie it off and then set it in the skimmer or hang it in front of a return. If you just pour the granules into the skimmer, they'll end up in the filter, and you'll backwash it all away.
    2. Would I adjust ph before CYA or after?
    Simultaneously. The CYA will take a few days to dissolve.
    3. Where do I go on here to change my password? I'm having lots of computer issues, phone issues, just trying to deal with a lot...There was a link when I had to have my password re-set, and I should have been able to follow that to change it, but my stupid computer wouldn't let me go there.
    4. Also, what do I adjust to make sure I'm notified when someone responds to a post of mine? I had several replies but had not been notified as I have in the past.
    Right below where it says "Settings". Click that. When that page opens, look at the left sidebar.
    5. Thanks for all the help. I know this is a process, just need someone to hold my hand and get me started in the right direction.
    Reread the SLAM instructions and follow it. It's pretty simple, just time-consuming. Adjust pH. While that is mixing, mess with the CYA. By then the pH should be right and you start adding bleach to get it to the right FC level for your CYA. If you needed to raise it, assume it's all dissolved and base the FC on your targeted CYA. Just keep brushing and keep the FC level up. The more consistent you are about that, the faster it will go. Backwash when the pressure rises 25% and get as much organic debris out as you can, either by vacuuming or with a leaf rake - a pool leaf rake, not the garden variety. And post pictures. We like green-to-clean photos.

    Some inspirational threads can be found here.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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